Deteriorated structure repair method and substratum for restoring and lining corroded structure

• US 5,268,392 A
• Filed: 10/26/1992
• Issued: 12/07/1993
• Est. Priority Date: 10/26/1992
• Status: Expired due to Fees

• Current Assignee: Richard L. Bertram
• Original Assignee: Richard L. Bertram
• Inventors: Bertram, Richard L.
• Primary Examiner(s): WELSH JR, MAURICE
• Application Number:
  US07/966,282
• Time in Patent Office: 407 Days
• Field of Search: 521/51, 521/53, 521/82, 521/99, 428/34.4, 428/34.7, 428/36.5, 428/159, 428/160, 428/308.4, 428/425.5, 427/136, 427/140, 427/207.1, 427/230, 427/273, 427/413
• US Class Current: 521/51
• CPC Class Codes: B05D 7/222 of pipes
• CPC Class Codes: C04B 41/52 Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
• CPC Class Codes: C04B 41/63 Macromolecular compounds
• CPC Class Codes: C04B 41/70 for obtaining at least two superposed coatings having different compositions
• CPC Class Codes: E03F 2003/065 Refurbishing of sewer pipes, e.g. by coating, lining
• CPC Class Codes: E03F 3/06 Methods of, or installations for, laying sewer pipes making pipes in situ F16L1/038 ; laying conduits in association with the digging of a trench E02F5/10; laying pipes in general F16L1/00
• CPC Class Codes: F16L 55/164 a sealing fluid being introduced in the pipe F16L55/1645 takes precedence
• CPC Class Codes: F16L 55/165 a pipe or flexible liner being inserted in the damaged section
• CPC Class Codes: F16L 58/1009 the coating being placed inside the pipe
• CPC Class Codes: F16L 58/1036 the coating being a preformed pipe F16L58/1027 takes precedence
• CPC Class Codes: Y10T 428/131 Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
• CPC Class Codes: Y10T 428/1321 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/1376 Foam or porous material containing
• CPC Class Codes: Y10T 428/24504 Component comprises a polymer [e.g., rubber, etc.]
• CPC Class Codes: Y10T 428/24512 Polyurethane
• CPC Class Codes: Y10T 428/249958 Void-containing component is synthetic resin or natural rubbers
• CPC Class Codes: Y10T 428/31598 Next to silicon-containing [silicone, cement, etc.] layer

Abstract

A concrete fluid structure deteriorated to the condition of removal of substance of the concrete by sulfuric acids and like corrosive material in contact therewith is restored by a substratum of epoxy foam, polyurethane foam, or a combination thereof having a relatively thin layer of polyvinyl chloride or polyethylene bonded to the outward facing surface of the foam and bonding the layer to the structure. A method for forming the substratum in the location of the deteriorated structure is described.

Claims

1. A method for restoring a concrete structure susceptible to deterioration by contact with corroding agents wherein portions of said structure are removed as a result of said deterioration to create void spaces where said structure existed, comprising the steps of:

a. hydrogenating a resin selected from the group consisting of polyurethane resin, epoxy resin and combinations thereof;

b. applying the hydrogenated resin along with a curing agent into the void spaces created by said removed portions of the structure;

c. allowing the resin and the curing agent to form a foam to a density of at least ten pounds per cubic foot, and to set, to form a foam resulting in an interior facing surface until said surface forms a skin tacky to touch;

d. preparing a surface of a layer of extruded thermoplastic liner for bonding said liner with said interior facing surfaces of said foam; and

,

e. applying said prepared surface of a layer of extruded thermoplastic liner to the interior facing surface of said foam, having the prepared liner surface adjacent said foam to bond said thermoplastic liner to said foam.

2. The method of claim 1 wherein said resin comprises a polyurethane resin and said curing agent comprises an isocyanate.

3. The method of claim 2 further comprising the step of blending said resin with cycloaliphatic amine prior to said applying step.

4. The method of claim 1 wherein said layer of extruded thermoplastic liner comprises polyvinyl chloride.

5. The method of claim 1 wherein said layer of extruded thermoplastic liner comprises polyethylene.

6. The method of claim 1 wherein said resin comprises an epoxy resin and said curing agent comprises an amine.

7. The method of claim 6 further comprising the step of blending said epoxy resin with isocyanate prior to said applying step.

8. The method of claim 1 wherein said resin comprises a blend of polyurethane resin and epoxy resin, and further comprising the step of blending said polyurethane resin and said epoxy resin prior to said applying step.

9. The method of claim 8 wherein said blending step, isocyanate is blended with said polyurethane resin and said epoxy resin.

10. The method of claim 8 wherein said curing agent is amine.

11. The method of claim 1 wherein said density of said foam is in the range of from ten to fifty-five pounds per cubic foot.

12. A substratum formed by the method of claim 1.

13. A surface substratum for lining and restoring a concrete structure susceptible to deterioration by contact with corroding agents and susceptible to having portions of said structure removed as a result of said deterioration to create void spaces where said structure existed, comprising:

a. a foam selected from the group consisting of polyurethane foam, epoxy foam and combinations thereof, adapted to be applied into said void spaces to result in a restored structure having an interior facing surfaces; and

,

b. a layer of an extruded thermoplastic liner bonded to said interior facing surface of said foam.

14. The surface substratum of claim 13 wherein said foam comprises a polyurethane foam.

15. The surface substratum of claim 14 further comprising cycloaliphatic amine blended with said polyurethane.

16. The surface substratum of claim 13 wherein said layer of extruded thermoplastic liner comprises polyvinyl chloride.

17. The surface substratum of claim 13 wherein said layer of extruded thermoplastic liner comprises polyethylene.

18. The surface substratum of claim 13 wherein said foam comprises an epoxy foam.

19. The surface substratum of claim 18 further comprising isocyanate blended with said epoxy foam.

20. The surface substratum of claim 13 wherein said foam comprises a blend of polyurethane foam and epoxy foam.

21. The surface substratum of claim 20 further comprising isocyanate blended with said polyurethane foam and said epoxy foam.

22. The surface substratum of claim 13 wherein said density of said foam is in the range of from ten to fifty-five pounds per cubic foot.